Method of manufacturing thick webs of wood pulp, cellulose, and similar materials



H. JENS METHOD OF MANUFACTURING EN THICK -WEBS OF WOOD LOSE, AND SIMILAR MATERI iled' D60. 18 1928 April 29, 1930.

ALS.

2 Sheets-Sheet l ULP CELLU Apnl 29, 1930. JENSEN 15756354 METHOD OF MANUFACTURING THICK WEBS 0F WOOD PULP, CELLULOSE, AND SIMILAR MATERIALS 2 Sheets-Sheet. 2

Filed D60. 18. 1928 X ,aM/k

50 consistency.

Patented Apr. 29, 1930 UNITED STATES PATENT oFFicE HARALD JENSEN, or o'sno, NORWAY METHOD OF MANUFACTURING THICK WEBS F WOO D PULP, CELLULOSE, AND

SIMILAR MATERIALS Application filed December 18, 1928, Serial No. 326,831, and in Norway December 23, 1927.

It is usual practice in the manufacture of paper to combine several continuous webs of material into a thicker web, but this method cannot be practiced Without special measures in case of continuous webs from strainers for thickness.

The present invention has for its object a method, whereby it will be possible to combine such webs of material without any observable rolling-out taking place. The method consists in this that the Webs coming from the strainers are subjected to a preparatory pressure, are thereupon combined and are then formed into a thick web in a common pressing device. By the preparatory pressing opera-.

tion the separate webs of material obtain a suitable cohesive force and are also rid from so much of their moisture contents that nosubstantial rolling-out will-take place in the last pressing device, whereas so much of moisture is nevertheless still present that the webs will stick together in the last pressing device without any auxiliary mediums.

The invention may be carried out by the use of suction drums or strainers of well known constructions by combining pulp webs coming from two different drums.

The invention includes, however, also an improvement of the arrangement and construction of the suction drums,-whereby their efiiciency is highly increased and whereby it will be possible, among other things, to produce the double pulp web by pressing together two webs coming from one and the same suction drum. In combination with these improvements the invention also comprises v novel arrangements of suction drums whereby it is made possible to utilize those parts of the drums not being used to form and deliver ulp webs for the purpose of obtaining a thicker ;he pulp which settles on these parts of the drum is removcd by means of scrapers or in other manner and is carried to the pulp reservoir, from which pulp is taken by the drum to form the web. By this means not only the efficiency of the machinery is improved, but the Web is made thicker so that the main purpose of the invention, to produce machinery for obtaining webs of greater thickness than usual, is thereby secured.

In the following reference will be had to diagrammatic drawings illustrating the idea of the invention and how it can be carried out.

Fig. 1 is a general view showing the use of two suction drums.

Fig. 2 shows a cross section-through a suction drum provided with two pulp reservoirs for forming two separate pulp webs.

Fig. 3 is a cross section through a suction drum of a modified construction.

Referring to Figure 1, 1 and 2 denote two suction drums, 3 and 4; removing rollers and i 5, 6 two continuous webs. The felts belonging thereto are not shown in the drawing, for the sake of simplicity. Sometimes felts are not at all necessary. Instead of combining the two webs 5, 6 direct, they are passed separately through a suitable prepressing device 6 and 8 respectively, and are then in a combined state passed through apressing device 9, from which the resulting web 10 issues with a thickness corresponding approximately to the total thickness of the separate webs 5 and 6.

Instead of taking the two pulp webs from two difierent drums, a single suction drum 11 may be arranged with two pulp reservoirs 12 and 13, as shown in Fig. 2. Felts 16' and 17 take each a pulp web from the'drum surface at points where boxes 14, 15 on the interior prevent the suction to act on the pulp deposited on the exterior of the drum.

If two suction drums of this construction are combined in the manner illustrated in Fig. 1, a web may be obtained composed of 4 primary webs.

The device shownin'Fig. 3 is in so far similar to that shown in Fig. 2 as there are also here two pulp reservoirs 12 and 13, but in this case the lower reservoir is made use of not to form a web of pulp, but to increase the consistency of the pulp, delivered to the web forming part of the apparatus. To this end I the box 15 on the inside of the drum may be connected with a pipe carrying air of more than atmospheric pressure so that the pulp is loosened and taken up in a trough 18. From this trough an endless transporter 19 takes the pulp up to the reservoir 12, when it is mixed with water or thin pulp so that the desired consistency is obtained. This mixing may also take place in a separate device arranged for the special purpose.

What I claim is:

1. In the production of pulp the process which consists in submitting pulp to the action of a suction drum adapted to cause the pulp to settle on parts of its exterior surface by way of a suction action and to be loosened or removed from the same on other parts of 'its surface, bringing pulp so removed and suitably diluted to another part of the surface adapted to cause such pulp to settle and form a web and then removing this web, carrying it to a press for removing excessive moisture and thereupon together with a second web to a press for uniting them to a uni 7 form, thick web.

2. In machinery for producing pulp in continual webs, a suction drum having two pulp reservoirs adjacent to its exterior surface, means to cause a suction action in its interior, means to prevent such suction action to come into force on certain parts of the drum outside of'said reservoirs and means to remove the layers of pulp deposited on the drum surface.

3. In machinery for producing pulp in continual webs, a suction drum, means to cause a suction action in its interior, means to prevent this suction to come into force on parts of the drum surface, reservoirs for pulp adjacent to the exterior of the strainer, means to remove pulp deposited on the strainer surface by one of the reservoirs from said'surface and carry it to another reservoir, means for taking off the-pulp web deposited by this reservoir and carry it to a moisture removin press and means to unite the so formed We with one or more other webs by means of pressure to a single uniform web of greater thickness.

In testimony whereof I have signed my name to this specification.

HARALD" JENSEN.- 

